Re: [PATCH v2 2/2] arm64: dts: amlogic: t7: khadas-vim4: allow the SD card to be power cycled

SD cards start at 3.3V and switch to 1.8V to reach UHS-I speeds. Some
cards refuse that switch, and the SD specification says the only way
to recover is to power the card off and start again.

SD_3V3 is marked regulator-always-on, so the supply never goes off,
the card stays stuck half way through the switch, and the MMC core
retries forever:

   mmc1: error -95 whilst initialising SD card

Drop regulator-always-on. regulator-boot-on still turns the supply on
at boot, and a card that refuses the switch now falls back to high
speed instead of failing to initialise.

Fixes: 8c45bf9ae4ef ("arm64: dts: amlogic: t7: khadas-vim4: Add power regulators")
Signed-off-by: Lucas Tanure <redacted>
Assisted-by: Claude:claude-fable-5
---
  arch/arm64/boot/dts/amlogic/amlogic-t7-a311d2-khadas-vim4.dts | 1 -
  1 file changed, 1 deletion(-)

diff --git a/arch/arm64/boot/dts/amlogic/amlogic-t7-a311d2-khadas-vim4.dts b/arch/arm64/boot/dts/amlogic/amlogic-t7-a311d2-khadas-vim4.dts
index 75d81ad6830d..c94afaaf8826 100644
--- a/arch/arm64/boot/dts/amlogic/amlogic-t7-a311d2-khadas-vim4.dts
+++ b/arch/arm64/boot/dts/amlogic/amlogic-t7-a311d2-khadas-vim4.dts

@@ -71,7 +71,6 @@ sd_3v3: regulator-sdcard-3v3 {
  		vin-supply = <&vddao_3v3>;
  		gpio = <&gpio GPIOD_11 GPIO_ACTIVE_LOW>;
  		regulator-boot-on;
-		regulator-always-on;
  	};
  
  	sdio_pwrseq: sdio-pwrseq {